code: def __call__(
      self, data: torch.Tensor, observed_indicator: torch.Tensor
  ) -> tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
      raise NotImplementedError
  
file_path: gluonts/src/gluonts/torch/scaler.py
imports: from __future__ import annotations
  from typing import Optional
  import torch
  from gluonts.core.component import validated
label_desc: Use image node_id 1 for calling the Scaler obj's underlying member method code with example usage: obj.__call__(data, observed_indicator) without return types